請問香港往北京航機飛行時平均最高之飛行高度???

Flying over China airspace we need to use meter(m) as a unit fot altitude reading, usually around 10,000 to 13,000 meters depends on the aircraft direction, weight, air traffic condition and navigational plan.

If using 35,000 - 38,000 ft, depending on the air traffic control and how busy the air space is at that time.

2008-04-11 22:54:19 補充：
35,000 - 38,000 ft, depending on the air traffic control and how busy the air space is at that time.